It is example of reflex-dom application that can be build with GHCJS and as Android and iOS applicatons.

Online demo is located here.

How to build and develop

See reflex-platform documentation about nix scripts that perform environment and build management.

Bellow I describe how to perform typical actions to build and develop the project. Prerequisites are:

• You have to install nix
• You have to build under MacOS to compile iOS native application or configure nix distrubted build.
• For NixOS users: configure binary cache from reflex-platform to avoid very long builds of tools. Non NixOS users should get binary cache for free.

Building backend

Backend is simple Warp that serves HTTP/JS from app-front/statics.

One shot build

To build server:

nix-build -A ghc.app-back

Result is placed in result symlink.

Development

The following instructions allow to build backend incrementally.

• Enter GHC environment, where all dependencies for backend and frontend are configured to use GHC:

nix-shell -A shells.ghc

• Compile with cabal new-build:

cd app-back
cabal new-build exe:app-back

• Run result with server.sh script.

• You can use ghcid for hot recompilation:

ghcid -c "cabal new-repl lib:app-back"

Or for executable:

ghcid -c "cabal new-repl exe:app-back"

Building frontend for desktop

Frontend assembles with Webkit-Gtk when compiled with GHC environment.

One shot build

To build desktop frontend:

nix-build -A ghc.app-front

Result is placed in result symlink. You can run it simply as:

./result/bin/app-front

Development

The following instructions allow to build frontend incrementally.

• Enter GHC environment, where all dependencies for backend and frontend are configured to use GHC:

nix-shell -A shells.ghc

• Compile with cabal new-build:

cd app-back
cabal new-build exe:app-front

• Run result with cabal new-run exe:app-front.

• You can use ghcid for hot recompilation:

ghcid -c "cabal new-repl lib:app-front"

Or for executable:

ghcid -c "cabal new-repl exe:app-front"

Building frontend for web browser

Frontend is compiled to raw JS when compiled with GHCJS environment.

One shot build

Non optimized build:

nix-build -A ghcjs.app-front

Optimize with closure compiler:

nix-build -A ghcjs.app-front --arg minimize true

Result is located in result/bin/app-front.jsexe/all.js and result/bin/app-front.jsexe/all.min.js.gz for optimized result.

Development

The following instructions allow to build frontend incrementally.

• Enter GHC environment, where all dependencies for backend and frontend are configured to use GHCJS:

nix-shell -A shells.ghcjs

• Compile with cabal new-build:

cd app-front
./build.sh

• In backend environment run server with ./serve.sh script in app-back folder as current.
• Now open http://127.0.0.1/index.html in your browser.

Building frontend for Android

Build apk with:

nix-build -A android.app-front -o android-result

Upload android-result/android-app-debug.apk to device manually or by android-result/bin/deploy.

Notes for Android

You can use native functions of Android system, see the entry module and bindings for activies.

Building frontend for iOS

Build with:

nix-build -A ios.app-front -o ios-result

Note: you need to perform it with nix distributed builds configured or on MacOS in the first place.